code: def test_consistency_complex(self, test_data):
      result = fftn_centered(test_data, spatial_dims=2)
      result = ifftn_centered(result, spatial_dims=2)
      assert_allclose(result, test_data, type_test=False)
  
file_path: MONAI/tests/test_fft_utils.py
imports: from __future__ import annotations
  import unittest
  from parameterized import parameterized
  from monai.data.fft_utils import fftn_centered, ifftn_centered
  from tests.utils import TEST_NDARRAYS, assert_allclose
label_desc: Use image node_id 3 for calling the TestFFT obj's underlying member method code with example usage: obj.test_consistency_complex(test_data) without return types